panjangpasangan sisi sejajar pada trapesium sama kaki berturut turut 6dm dan 12 dm . jika keliling trapesium 28 dm , luas trapesium ... dm2
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28 =AB+BC+CD+DA
AB = 7
BC = 7
CD = 7
DA = 7
L.trap = jml sisi sjjr x t : 1/2
=18 x 7 : 1/2
=63
28 dm = 6 dm + 12 dm + C + D
28 dm - 18 dm = C + D
10 dm = C + D
karena C = D jadi C = D = 10dm/2 = 5 dm
tinngi = 4dm
luas trapesium = ( A + B ) x t x
= ( 6 + 12 ) x 4 x
= 36 dm²